Sheen began by talking about the media storm surrounding his erratic behavior earlier this year, saying: "Wow... it was like a runaway train that I was kind of the reluctant conductor of, and it just kept going.

"I said some things that were a little out there... I might have just overshot the mark a little bit - but these are just metaphors, Jay. I didn't really believe in tiger blood or Adonis DNA, I mean, these were just jokes, you know!"

Sheen added of his catchphrases such as 'tiger blood' and 'winning': "I wish I could just come out here and explain it all to you and all these good people, but I think it would make less sense if I tried to explain it - if that's possible, you know?"

He then quipped: "I thought I could come back - kind of like you did. I mean that with all love and respect," to which Leno responded: "Well, at least one of us got their job back."

Sheen said that while he had not had contact with any of the Two and a Half Men executives since he was fired, he had "zero" animosity towards them and revealed that he understood the reasons behind his dismissal, saying: "No, no, I'd have fired my ass too. Well, maybe not like they did... it is what it is, you know?

"It was bad, and I own my part in that, and I just want to make everything right, you know? I should have been a little more responsible about the condition I was showing up in. I was hitting my marks, I was delivering, but maybe at a sub-par level. But that's alright. As I said, it is what it is and I just want to move forward."

Sheen continued: "I tried [to make contact]. I couldn't get a return phone call. Again, I don't think I would have returned my phone calls."

When asked about his replacement Ashton Kutcher, he said: "It's hard to give advice to a guy that accomplished. I would just give him a hug and say, 'Make me proud, dude'."